According to the
Mexican copyright law
(23-07-2003), Article 14, case 7 & 8: "
Copyright shall not apply
to
shields, flags or emblems of any country, state, municipality or political division
;
names, acronyms, symbols or emblems of international governmental organisations, or any other organization officially recognized
; or
legislative, regulatory, administrative or judicial texts, as well as their official translations
."
Hence it is assumed that this image has been released into the
public domain
.